EP0803605B1 - Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée - Google Patents

Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée Download PDF

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Publication number
EP0803605B1
EP0803605B1 EP97111032A EP97111032A EP0803605B1 EP 0803605 B1 EP0803605 B1 EP 0803605B1 EP 97111032 A EP97111032 A EP 97111032A EP 97111032 A EP97111032 A EP 97111032A EP 0803605 B1 EP0803605 B1 EP 0803605B1
Authority
EP
European Patent Office
Prior art keywords
press
nip
roll
extended
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97111032A
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German (de)
English (en)
Other versions
EP0803605A2 (fr
EP0803605A3 (fr
Inventor
Jorma Laapotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP0803605A2 publication Critical patent/EP0803605A2/fr
Publication of EP0803605A3 publication Critical patent/EP0803605A3/fr
Application granted granted Critical
Publication of EP0803605B1 publication Critical patent/EP0803605B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls

Definitions

  • the invention concerns a press section of a paper machine, which press section comprises at least three consecutive nips and wherein the paper web to be dewatered is passed as a substantially closed draw on support of a press fabric and of a smooth roll face or of a corresponding transfer band.
  • a drawback is the transfer of the web from one extended-nip press into the second and/or third extended-nip press on the face of the glide-belt mantle of the extended-nip press, because that requires a smooth face which does not receive water and which has good web transfer and adhesion properties.
  • the first nip is not an extended nip that removes water efficiently in both directions, and the overall concept is not a compact press section of several nips.
  • the drawbacks include, above all in the embodiments shown in Figs. 1 and 2, the press section consisting of two separate extended-nip presses alone, in which press section the high-load pressing in both of the extended nips is carried out on the face of the same press felt and, moreover, the web is transferred over the long distance between the nips between two re-wetting felts and on the face of one felt.
  • the geometries of the press sections as shown in Figs. 3, 5 and 6 in said document are more compact, but the same press felt runs through both of the extended nips, and the water-absorbing capacity of the felt is no longer sufficiently efficient in the second extended nip.
  • the transfer of the web from one extended nip into the other relies fully on the differences in the surface structures of the press felts, and no devices have been used to secure the web transfer.
  • the press sections illustrated in Figs. 1,1a,2,3,3a and 3b in document DE-A-4 026 021 involve the drawback that transfer means are used which run through all the press nips and which have a dewatering capacity lower than that of a felt. Since the largest amount of water is removed in the first nip, the dewatering in one direction is limited by the use of said transfer means.
  • the transfer means that are used in the constructions as shown in Figs. 2,2a,3,3a,3b consist of the glide belt of the extended-nip press, in which case the dewatering in the first nip in one of the directions is excluded completely. Said glide belt must be fully impervious and smooth.
  • a press section comprising the features of the pre-characterizing clause of claim 1 is known from document EP-A-0 289 477, in particular its Figure 10.
  • the first nip is formed as a roll nip between a press roll and a suction roll.
  • the press section is designed such that the dry solids content after the press section is comparatively high, and it comprises a hot-pressing device which is arranged downstream of the third nip.
  • the hot-pressing device comprises a heated cylinder and a press shoe device which, in combination, form an extended nip.
  • the first nip in the press section is an extended nip of a first extended-nip press.
  • the first extended-nip press in the press section efficient two-sided dewatering is achieved, which contributes to securing the symmetry of the structure of the web in the z-direction and the symmetry of the density and porosity of the web faces. Also, in the first extended-nip press, a relatively high dry solids content is obtained for the web, so that the direction of the web can be changed substantially after the extended-nip press without a risk of breaks, which contributes to the possibility to provide a press section which has a compact construction and which also occupies a sufficiently small space in the machine direction in view of modernizations.
  • an extended-nip press is used as the last nip in the press section, in which extended-nip press the draining direction is contrary to the direction in the roll nips preceding the extended-nip press, which contributes to securing or improving the symmetry of the web in the z-direction.
  • the only figure is a schematic side view of an exemplifying embodiment of the invention.
  • the paper web W is separated from the forming wire 10 and transferred at the pick-up point P onto the pick-up felt 11, being aided by the suction zone 12a of the pick-up suction roll 12.
  • the pick-up felt 11 operates as a water-receiving upper fabric in the first extended nip NP 1 , into which the web W is transferred on the lower face of the felt 11.
  • the extended nip NP 1 there is a water-receiving lower felt 28, which is guided by guide rolls 29.
  • the lower press component in the first extended nip NP 1 is a hose roll 20 provided with a flexible mantle 21.
  • a press shoe 22 which is loaded by hydraulic cylinders, whose pressures can be regulated in order to regulate the level and the distribution of the compression pressure in the extended nip NP 1 both in the direction of progress of the web W and in the transverse direction.
  • the hose roll 20 is a press component in itself known, and in respect of its construction, reference is made by way of example to document FI-B-96789, Figs. 10;11;12.
  • the upper press component of the extended nip NP 1 is a suction roll 13b which is provided with a perforated mantle 13" and in the interior of whose mantle there are two successive suction zones 13c and 13d. Of said zones, the first one 13c is placed facing the press zone of the extended nip NP 1 , and the next zone 13d in the sector on which the run of the web W and of the upper felt 11 is turned to the vertical direction.
  • the suction roll 13b may be used, e.g., with thinner paper grades when the loading in the extended nip NP 1 is lower than average, in which case the mantle 13" can be made to withstand the pressure load in the extended-nip press.
  • the first extended-nip press forming the extended nip NP 1 even at high web running speeds, a sufficiently long dwell time and efficient dewatering are obtained for the web, said dewatering being additionally two-sided and symmetric.
  • the dry solids content of the web W on its arrival in the extended nip NP 1 is typically in a range of 12...20 %, and immediately after the extended nip NP 1 the dry solids content of the web W is, as a rule, in a range of 30...40 %.
  • the proportion of the efficient dewatering taking place in the extended nip out of the entire dewatering taking place in the press section is typically in a range of 30...75 %, most commonly in a range of 35...55 %.
  • the upper roll 13b in the extended nip NP 1 turns the running direction of the upper felt 11 and of the web W, which is transferred on support of said felt, from substantially horizontal to substantially vertical or to relatively steeply upwards inclined.
  • This change (angle a) in the running direction of the upper felt 11 and of the web W contributes to an improved utilization of the space taken by the press section.
  • the press section includes a smooth-faced 31 centre roll 30, in whose connection there are preferably two roll nips N 1 and N 2 .
  • the length of the press zones in the roll nips N 1 and N 2 is substantially, typically by almost one order, shorter than in the extended nips NP 1 and NP 2 , in which the length of the press zone is typically 100...300 mm.
  • Said roll nips N 1 ,N 2 are placed on successive upper quarters of the smooth-faced 31 centre roll 30, by means of which arrangement a favourable distribution of the nip loads on the centre roll 31 is obtained.
  • the upper felt 11 of the extended nip NP 1 which is also the pick-up felt, additionally operates as a water-receiving press fabric in the first roll nip N 1 , after which the web W follows the smooth face 31 of the centre roll 30, being separated from the upper felt 11.
  • the second roll nip N 2 is formed by the centre roll 30 together with the hollow-faced 32' press roll 32. Through the second roll nip N 2 , the press felt 33 runs, which receives water and is guided by the guide rolls 34.
  • the web W is separated as a short free draw from the smooth face 31 of the centre roll 30, being transferred onto the lower felt 36 as guided by the guide roll 35 and aided by a suction zone of the transfer-suction roll 37, which lower felt 36 operates as the lower press fabric in the second extended nip NP 2 .
  • the second extended nip NP 2 is formed by a lower hose roll 40, which is provided with a flexible mantle 41 and a loading shoe 42.
  • the upper roll of the extended nip NP 2 is a solid-mantled, preferably variable-crown and smooth-faced 39' press roll 39.
  • the web W follows the smooth face 39' of the press roll 39, from which it is separated as a short free draw W 1 , being transferred over the paper guide roll 53 onto the drying wire 52.
  • the press roll 39 and/or the centre roll 30 may be heated, and the heating can be carried out, e.g., by means of hot water that circulates through bores in the roll mantle, in respect of which details reference is made to document EP-A1-597814.
  • a suction box 38 or equivalent Before the second extended nip NP 2 , inside the loop of the lower felt 36, there is a suction box 38 or equivalent.
  • the latter guide roll of the lower felt 36 is denoted with the reference numeral 54.
  • the extended nip NP 2 can be replaced by a corresponding roll nip, which is represented by the reference denotation N 3 in parentheses.
  • the upper roll 39 is a preferably smooth-faced press roll, and in the position of the lower hose roll 40 there is a hollow-faced and solid-mantled rigid press roll, if necessary, a variable-crown press roll.
  • the suction roll 13b considerably facilitates the transfer of the web W into the roll nip N 2 as the suction zones 13c and 13d of the suction roll 13b transfer the web W reliably.
  • the hose roll 70 forms the second extended nip NP 2 '
  • the hose roll 80 forms a possible third extended nip NP 3 ', if any, in connection with the centre roll 30.
  • an extended nip NP 2 ' and/or NP 3 ' is/are employed in connection with the centre roll, as a rule, such an embodiment is preferable in which the first nip in connection with the centre roll is a roll nip N 1 and the second nip is an extended nip NP 3 ', but other combinations of nips are also possible.
  • the press section shown in the figure is best suitable for printing paper grades, such as newsprint, SC-paper, LWC base paper, and fine paper, but said press sections can also be used for boards, such as linerboard or corrugating medium.
  • the frames of the press section are normal frames that permit quick replacements of felts and rolls.
  • the extended nips NP 1 ;NP 2 (NP 2 ',NP 3 ') it is preferable to use press felts slightly heavier and thicker than normal, because the amount of water that is removed in the extended nip NP 1 ,NP 2 (NP 2 ',NP 3 ') is larger and the high press impulse tends to produce a marking of the fabric or of the hollow face on the paper.
  • the glide-belt mantle 21;41;81 is preferably hollow-faced, such as grooved, blind-drilled, or provided with other recesses.
  • a particularly compact press section is produced so that, for example, in modernizations of paper machines, in which the dewatering capacity of the press section is increased, e.g., in order to increase the running speed of the paper machine, the press section can be accommodated in the place of an existing press section, e.g., consisting of three or four nips which are exclusively roll nips, such as in place of the applicant's Sym-Press II® press.

Landscapes

  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Peptides Or Proteins (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Claims (10)

  1. Section de pressage pour une machine à papier pour essorer une bande de papier (W) formée sur une toile de formage (10) d'une section de formage, dans laquelle la section de pressage comprend au moins trois interstices successifs (NP1, N1, N2, NP2', NP3') et dans laquelle la bande de papier (W) devant être essorée est déplacée, sur un trajet sensiblement fermé, en étant supportée par un tissu de pressage (11, 28, 36) et une face lisse de rouleau (31, 39) de la section de pressage,
       dans laquelle le premier interstice (NP1) dans la section de pressage est formé par une presse qui comprend comme composant de pressage supérieur un rouleau d'aspiration (13b) pourvu d'une enveloppe (13") pourvu de perforations traversantes,
       dans laquelle deux tissus de pressage opposés (11, 28), qui reçoivent l'eau, traversent la zone de pressage du premier interstice (NP1), alors que la bande est disposée entre lesdits deux tissus de pressage, de sorte que dans le premier interstice (NP1), l'essorage s'effectue dans deux directions en travers des deux faces de la bande de papier (W),
       dans laquelle le second interstice (N1, NP1', NP2') et le troisième interstice (N2, NP3') dans la section de pressage sont formés en liaison avec un rouleau central à face lisse (30), qui est monté à un niveau nettement supérieur au niveau dudit premier interstice (NP1),
       dans laquelle le tissu supérieur de pressage dans ledit premier interstice (NP1) est un tissu de saisie (11) servant à saisir la bande de papier à partir de la toile de formage (10), ledit tissu saisi (11) portant la bande de papier sur sa face inférieure à travers ledit premier interstice (NP1) et à travers ledit second interstice (N1, NP2'), et dans laquelle, en aval dudit premier interstice (NP1), la bande de papier (W) est séparée du tissu de pressage inférieur (28) au moyen dudit rouleau d'aspiration (13b), et la direction de défilement du tissu de pressage supérieur (11) et de la bande de papier (W) pivote sous un angle (a), qui est égal ou supérieur à environ 45°,
       dans laquelle ledit troisième interstice (N2, NP3') possède un tissu de pressage (33) qui lui est propre et qui reçoit l'eau,
       caractérisée en ce que
       ledit premier interstice est un interstice étendu (NP1) d'une première presse à interstice étendu.
  2. Section de pressage selon la revendication 1, caractérisée en ce que
       ledit rouleau d'aspiration (13b) comprend deux zones successives d'aspiration (13c, 13d), parmi lesquelles la première zone (13c) est placée dans l'étendue de la zone de pressage de la première presse à interstice étendu et l'autre zone (13d) dans le secteur tournant, le tissu supérieur (11) et la bande de papier (W) changeant de direction et ce sur ledit angle (a).
  3. Section de pressage selon la revendication 1 ou 2, caractérisée en ce que
       au moins l'un desdits second et troisième interstices est un interstice entre rouleaux (N1 et/ou N2).
  4. Section de pressage selon la revendication 1 ou 2, caractérisée en ce que
       au moins l'un desdits second et troisième interstices est un interstice étendu (NP2' et/ou NP3').
  5. Section de pressage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que
       ledit second interstice (N1, NP2') et ledit troisième interstice (N2, NP3') sont disposés au niveau de quarts supérieurs opposés du rouleau central (30).
  6. Section de pressage selon l'une quelconque des revendications 1 à 5, caractérisée en ce que
       ladite première presse à interstice étendue comprend un composant de presse inférieur, qui est formé par un rouleau tubulaire (20) pourvu d'une enveloppe flexible (21), contre la face intérieure duquel est appliqué un patin coulissant de pressage (22), chargé par les pressions d'un fluide sous pression, agit dans la zone de la presse à interstice étendu.
  7. Section de pressage selon l'une quelconque de revendications 1 à 6, caractérisée en ce que
       un quatrième interstice de pressage (N3, NP2) est disposé dans la section de pressage, en aval dudit troisième interstice.
  8. Section de pressage selon la revendication 7, caractérisée en ce que
       ledit quatrième interstice (NP2) est formé par une seconde presse séparée à interstice étendu, qui est pourvue d'un tissu de pressage inférieur (36) et dans laquelle un composant de pressage inférieur est un rouleau tubulaire (40) pourvu d'une enveloppe tubulaire flexible (41), et un composant supérieur de pressage est un rouleau de pressage à face lisse (39), sur la face lisse (39') duquel la bande de papier (W) circule sur une toile de séchage (52), dans une section formant séchoir ou à proximité d'une telle section.
  9. Section de pressage selon l'une quelconque des revendications 1 à 8, caractérisée en ce que
       après la première presse à interstice étendue, la face lisse de la bande de papier (W) est soumise à un fluide, qui chauffe la bande et est amenée à partir d'une boíte à vapeur, de préférence située dans une zone, dans laquelle est disposée une zone d'aspiration (13d) sur la face opposée de la bande de papier (W) ou est soumise à un dispositif délivrant un rayonnement infrarouge pour intensifier l'essorage dans le second interstice de pressage et dans les interstices de pressage successifs.
  10. Section de pressage selon l'une quelconque des revendications 1 à 9, caractérisée en ce que
       le rouleau de centrage (30) de la section de pressage et/ou du rouleau de pressage (39) de la seconde presse à interstice étendu peuvent être chauffés.
EP97111032A 1993-12-08 1994-12-06 Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée Expired - Lifetime EP0803605B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI935501A FI112391B (fi) 1993-12-08 1993-12-08 Paperikoneen puristinosa, jossa käytetään pitkänippipuristinta
FI935501 1993-12-08
EP94119255A EP0657579B1 (fr) 1993-12-08 1994-12-06 Section de pressage d'une machine à papier utilisant une presse à zone de pressage prolongée

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP94119255.1 Division 1994-12-06
EP94119255A Division EP0657579B1 (fr) 1993-12-08 1994-12-06 Section de pressage d'une machine à papier utilisant une presse à zone de pressage prolongée

Publications (3)

Publication Number Publication Date
EP0803605A2 EP0803605A2 (fr) 1997-10-29
EP0803605A3 EP0803605A3 (fr) 1998-09-30
EP0803605B1 true EP0803605B1 (fr) 2002-04-10

Family

ID=8539103

Family Applications (4)

Application Number Title Priority Date Filing Date
EP94119255A Expired - Lifetime EP0657579B1 (fr) 1993-12-08 1994-12-06 Section de pressage d'une machine à papier utilisant une presse à zone de pressage prolongée
EP98115105A Withdrawn EP0887461A3 (fr) 1993-12-08 1994-12-06 Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée
EP98100237A Withdrawn EP0841431A3 (fr) 1993-12-08 1994-12-06 Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée
EP97111032A Expired - Lifetime EP0803605B1 (fr) 1993-12-08 1994-12-06 Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée

Family Applications Before (3)

Application Number Title Priority Date Filing Date
EP94119255A Expired - Lifetime EP0657579B1 (fr) 1993-12-08 1994-12-06 Section de pressage d'une machine à papier utilisant une presse à zone de pressage prolongée
EP98115105A Withdrawn EP0887461A3 (fr) 1993-12-08 1994-12-06 Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée
EP98100237A Withdrawn EP0841431A3 (fr) 1993-12-08 1994-12-06 Section de pressage pour une machine à papier utilisant une presse à zone de pressage prolongée

Country Status (9)

Country Link
US (1) US5833810A (fr)
EP (4) EP0657579B1 (fr)
JP (2) JP3188369B2 (fr)
KR (1) KR0161658B1 (fr)
AT (2) ATE216005T1 (fr)
CA (1) CA2137432C (fr)
DE (3) DE69430388T2 (fr)
FI (1) FI112391B (fr)
TW (1) TW279185B (fr)

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JP3681914B2 (ja) 2005-08-10
TW279185B (fr) 1996-06-21
ATE216005T1 (de) 2002-04-15
FI935501A (fi) 1995-06-09
JPH11286887A (ja) 1999-10-19
EP0803605A2 (fr) 1997-10-29
DE69418155T2 (de) 1999-12-16
EP0803605A3 (fr) 1998-09-30
EP0887461A2 (fr) 1998-12-30
KR950018943A (ko) 1995-07-22
EP0841431A2 (fr) 1998-05-13
CA2137432A1 (fr) 1995-06-09
DE69418155D1 (de) 1999-06-02
EP0657579A1 (fr) 1995-06-14
KR0161658B1 (ko) 1999-01-15
EP0841431A3 (fr) 1998-09-30
DE803605T1 (de) 1998-03-05
JPH07207593A (ja) 1995-08-08
EP0657579B1 (fr) 1999-04-28
EP0887461A3 (fr) 1999-01-27
US5833810A (en) 1998-11-10
FI935501A0 (fi) 1993-12-08
FI112391B (fi) 2003-11-28
DE69430388D1 (de) 2002-05-16
ATE179470T1 (de) 1999-05-15
DE69430388T2 (de) 2002-11-07
CA2137432C (fr) 1999-09-21
JP3188369B2 (ja) 2001-07-16

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